Improvement in fireplaces



0.. B. GREGORY.

Fireplace. No. 76,750. Patented April 14,1868.

N. PEIERS, PHOTO-LITHOGRAPHER. WASHINGTON. D. O.

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Letters Patent No. 76,750, dated April 14, 1868.

IMPROVEMENT IN FIREPLAO'ES.

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TO ALL, WHOM IT MAY CONCERN:

Be it known that I, O. B. GREGORY, of Beverly, Burlington county, Stateof New Jersey, have invented certain Improvements in Fireplaces; and Ido hereby declare the following to be a full, clear, and exactdescription of the same. 7

My invention consists of certain improvements, fully describedhereafter, in -the fireplace for which Letters Patent were allowed to meon the 28th day of December, 1867, the said improvements effecting sucha thorough circulation of the air for supporting combustion, that anintense and uniform heat is obtained.

In order to enable others skilled in the art to make and use myinvention, I will now proceed to describe its construction andoperation, reference being had to the accompanying drawing, which formsa part of this specificntion, and in which-- I Figure 1 is a verticalsection of my improvement applied to a stove, and

Figure 2 a sectional plan view on the line 1 2, fig .1. i

A represents the outer casing, b the grate, c the-:bottom-plate, and Dthe ash-box of a stove.

The hollow cylinder or fire-pot, B, of the. stove, which rests upon thebottom-plate a, may be madeof cast iron or fire-clay, and is perforatednear its upper end with openings or slits a, for a purpose describedhereafter, and theannular space d, between this cylinder and the outercasing of the stove, is covered at the top by a plate or fiange,f, fig.1.

Within the annular space dis a short cylindrical casing, F, which alsorests upon and is secured to the base-plate c of the stove, and has, atits upper end, a flange,'g, in contact with the fire-pot B, a smallerannular space, i, being thus enclosed, which communicates with theash-box D, through a number of perforations, j, in the base-plate.

7 Near to the upper end of the cylinder F is a flange, 7c, whichprojectstowards but is not quite in contact with the fire-pot B, and a similarflange, Z, on the outer casing A of the stove projects towards thecylinder F, two annular air-chambers, m and n, being thus formed.

Air is admitted to the chamber at through a.tube,'p, and to the chambern through an opening, 1, in the casing A, both the tube and openingbeing opened or closed at pleasure, by means of sliding dampers g and q,as shown in fig. 1.

The annular space 02, between the outer casing A and cylinder 13, andabove the flange Z,,is filled with gravel, granulated bricks,iron-turnings, or other equivalent granulated material, which cannot bereadily affected by the heat, and inthe mass of which are numerousinterstices for the passage of air.

The space 2', below the flange 7c, is also filled with granulatedmaterial, in the same manner as the space d3 On first igniting the fuelwithin the store, the air necessary to the support of combustion isadmitted,- through the tube 22, into the air-chamber m, where it freelycirculates around the cylinder B. From the chamber m the air passesdownwards, through the insterstices of the granulated material containedin the spaces", thence through the perforations j, and upwards, throughthe grate b, to the fire, as clearly indicated by the arrows, fig. 1. pv

The damper 9 may then be opened, and air admitted to the chamber a,where, after freely circulating, it passes upwards, as shown by thearrows, through thegranulated material contained in the space 01, andthence, through the openings or slits a in the upper part of thecylinder B, into the fireplace, where it combines with the inilaimnablegases which rise from the ignited fuel.

In the fireplace for which the above-mentioned Letters Patent wereallowed to me, air was admitted at two points, and cansedto. passthrough granulated material, as in the present-instance, but thecirculation of air was somewhat imperfect. This defect I have remediedby employing the air-chambersm and n, in which, as above described, theair is caused to circulate before passing through the granulatedmaterial. I have found, by repeated experiments, that the result of thisthorough circulation of the air is a fire of intense and uniform heat,and the entire consumption of the fuel. I l

Although I have described my invention as applied to a stove, it will beevident that it may be used in connection with heating-furnaces,furnaces for steam-boilers, and, in fact, in any case in which anintense heat is required, the form of the several casings and chambersbeing modified accordingly.

I claim as my invention, and desire to secure by Letters Patent- Theair-chambers m and 'n, situated between the inner perforated casing Band outer cnsing A of a fireplace, and communicating with chamberscontaining gravel or other suitable granulated material, through whichthe air must pass prior to entering the fire-pot, all substantially asand for the purpose herein set forth.

In testimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses.

G. B. GREGORY.

Witnesses:

JOHN WHITE,

0. B. Peron.

